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Question about PIP battery longevity

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by CRT1, Aug 3, 2012.

  1. CRT1

    CRT1 New Member

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    So I am in the beginning stages of considering the PIP. I am of the ilk who buy cars new and run them for 15 years. So the life of the PIP battery is a primary concern to me.

    Toyota says the PIP battery is 4.4 kWh Lithium-Ion (not sure the exact chemistry). Users say it takes 3 kWh per charge. That is 68% of full charge so it sounds like Toyota has programed the thing to run from 84% to 16% or something like that, which sounds pretty conservative.

    My commute is between 11 and 17 miles depending on route and stops. I am thinking with some basic hypermiling techniques I currently employ, I could get to work, charge, and get home all EVmost of the time. If the battery stays strong I will make my additional investment over the regular Prius back no problem. As the battery degrades with age that will cut into EV range, and make the vehicle a bit less compelling.

    Question: If I am cycling this battery 2x per day, living in the Boston area (not too hot or cold), how long is it reasonable to expect this battery to last? It needs to give 11,000 cycles over the 15 years of ownership. Assuming 12,000 miles per year, 2/3 in EVand 1/3 in HEV mode, that is about 180,000 miles total and 120,000 of that in pure EV.

    Will it follow the degradation that Nissan claims the for the Leaf: 80% after 5 years, 70% after 10 years . . . 12 years? 15 years? 8 miles of EV range after 10 years does not sound great . . .

    The problem I am struggling is that I want to move over the a plug-in vehicle but there is nothing wrong with my current vehicle and though I love the PIP, the 11-mile EV range is a little low. I don't like the Volt do to is poor gas FE and the Leaf does not give the extended range I need for road trips. Do I jump now and live with the current PIP for the next 15 years or wait a year or two when there will be more plug-in options available (like the 2015 PIP)?
     
  2. If there are any gentle hills on your commute the range can be extended. I have 23 miles twice. Also, my car is approaching 5000 miles and my initial charges were in the 12 mile range, but now I'm getting a lot in the 15 mile range. I think the memory in both portions of the battery are improving. As for your other questions, I am not a prognosticator, however, I say go for it, the PIP is great ! Just from a fun angle, there's nothing better.
     
  3. CRT1

    CRT1 New Member

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    Congrats on the efficient driving, Andyprius! I think the trip computer that estimates range learns based on your driving habits. You are not getting more absolute range or battery performance, the trip computer is just learning that you are a very efficient driver and so it is giving you longer range estimates. Either way this is a good thing! Keep up the good work!
     
  4. devprius

    devprius /dev/geek

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    Those are good questions, and ones that have been asked before. Unfortunately, nobody seems to know the answer. The battery pack is warrantied for 10 years or 150K miles in states that have adopted California's emissions standards. That means if the pack fails within that timeframe, Toyota has to replace it. What isn't spelled out in the warranty booklet is at which point does degradation of the pack qualify as a failure for purposes of a warranty replacement. If the pack can allow the car to operate as a normal hybrid, but not have useful EV range (2 or 3 miles at best), that might not be enough for them to want to replace it. It's a gamble as to what will happen 5 or 10 years down the road. Some of us here obviously have taken that gamble.
     
  5. Jimbo69ny

    Jimbo69ny Active Member

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    Thats a tough call. If you are a patient person by nature then wait a year or two till the technology advances a little. (although who knows how much) You could end up with something that is better and hopefully cheaper.

    If your not a patient person, buy buy buy!

    I just purchased my car a week ago and I LOVE IT!!! So far I have about 240 miles on it. My gauge tells me that I am using ev mode 58% of the time and hv mode 42%. I hope to increase the ev percentage. I am averaging 138 mpg on the current tank of gas and I am honestly not even trying. The only thing I try to do is to keep it in ev. I will accelerate as fast as I want to as long as I stay in ev. It is everything I hoped for and more.
     
  6. CRT1

    CRT1 New Member

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    Thanks, Devprius. I am inclined to take the gamble, but I want to get a handle on the risk. Is there anything that can be gleaned from Li-Ion battery research? Someone must be beating the snot out of these cells in some lab somewhere. What is the exact chemistry of the PIP battery?
     
  7. rogerv

    rogerv Senior Member

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    I regularly see 14 to 15 miles per charge on EV, and even 16 miles a couple of times. This is all in-town driving on surface streets, mostly limited to 45 mph max with a few stretches of 50 mph limits, and some minor elevation changes. The car learns your type of driving, and estimates your EV range accordingly. Mine usually indicates range of 14+ miles, well in excess of the advertised 11 mile EV range. I have noticed that if I do a lot of freeway driving, the estimate of EV range is lower for a couple of days until I get some continuous EV driving in again. Good luck, whatever you decide.
     
  8. ryogajyc

    ryogajyc Active Member

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    It takes a little more than 3 kWh to charge (~3.2 kWh) and there is a charging efficiency of ~85%, so the actual amount of battery charge is ~2.7 kWh and the battery goes from ~85% to ~25%.
     
  9. devprius

    devprius /dev/geek

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    I do a lot of freeway driving and have a lot of hills to deal with. My normal EV range is around 10 miles. It started out as 13.2, and slowly dropped to 10.3. I modified my use of the EV button and got it backup to 10.8. Then I went to the dealer and had it serviced. It dropped to 9.3 miles. It's now back up to 10 miles. My car has 10,000 miles on it. I'm not too worried about the battery pack.
     
  10. devprius

    devprius /dev/geek

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    The actual EV range of the battery pack is from 23.1% to 85%. The HV range is from around 15% to 23.1%. We assume 15% is the lowest the battery pack can get, but I don't think anyone has actually seen how low it can go. I've never gotten below 4 battery bars in HV mode.

    The car charges slightly more efficiently at 240V versus 120V. One of these days I'll have to break out the clamp-on meter and measure the actual usage at the panel versus what the car is reporting as going into the battery pack.
     
  11. bisco

    bisco cookie crumbler

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    even tho you usually keep your cars a long time, the tech is changing so rapidly, you may want to consider leasing. it will be hard to own one of these and worrying about battery longevity when something comes along with more range and knowledge of battery chemistry improves.
     
  12. drinnovation

    drinnovation EREV for EVER!

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    No-one knows for sure on the battery. Without a warrany on range or capacity (like the Volt has), it would make me worry about it too.

    You articulated why not the Volt.. but have you considered waiting just a bit or a C-Max Energi? It is reported to have a longer EV range, higher max EV speed but still expected to have better than Volt MPG in CS mode. (Nothing official yet).
     
  13. CRT1

    CRT1 New Member

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    I am a little biased against the ~3900 lb curb weight of the C-Max Energi and the lower highway gas mileage (44 mpg) but other than that it looks like a pretty sweet ride. I guess if it delivers the MPGs then it should be considered despite the weight.

    The ~20 mile EV range could probably be stretched out so I would only have to charge at work (free electrons) on weekdays and home on weekends. Beyond the free aspect, the larger battery would only need to be charged once per day rather than twice, thus cutting the cycles over the 15 years to 5,500 which seems a little more reasonable to me. Also, it looks like the C-Max battery is actively air cooled which should help with longevity.

    The PIP seems like a tighter solution more in-line with my wants/needs, but the battery concern still lingers . . .
     
  14. Tracksyde

    Tracksyde Member

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    The PiPs battery is also actively air cooled. I don't know if the Leafs is, but I'd be surprised if it wasn't also actively air cooled since its so easy to do.
     
  15. cwerdna

    cwerdna Senior Member

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  16. Flaninacupboard

    Flaninacupboard Senior Member

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    Autotrader has several Mitsubishi i's for ~$22k, and you can buy a good used prius for ~$10k I understand. The i will cover your commute no problem at all, and you'll actually end up using it a lot for local trips (really it becomes your "primary" car) and the prius has great highway mileage for when you want to do trips, or just need to do more than ~60 miles in a day/carry five people/carry something big and bulky.

    With the DOD toyota are using ~5,000 cycles or more seems realistic. With two per working day that will give you ten years use(with some reduced capacity). I wouldn't sweat it too much, you seem level headed enough to understand than even if at ten years age the car requires (or you find the capacity loss unacceptable) a new battery, a $3k investment would be worth it if you're keeping the vehicle for another five years. That $3k is obviously a guess, but as of today you can buy lifepo4 cells for $450/kwh or less. I suspect that if the PIP is very popular then aftermarket upgrades will also exist, so maybe at ten years you'll buy a 10kwh pack for $5k instead and get about 40 miles EV range. Although personally I expect the plugin version of gen4 to be better designed, packaged, specced, cheaper, and massively more popular, so if i were going to develop aftermarket replacement packs I would be waiting for that.
     
  17. john1701a

    john1701a Prius Guru

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    This first plug-in Prius will become quite enticing for enhancement as the system, since the system was designed deliver EV anyway and already has a charger & port. Just think what people will do when battery cost is a fraction of what it is now.

    While driving, the battery-pack will draw up to 38 kW, then the engine will join in to provide some thrust and additional electricity. A larger battery could provide that additional electricity, as well as additional capacity.

    This could result in unusually high resale value, even with lots of miles. The gas-engine is babied, not ever having to work hard. And the brushless electric-motors can last a remarkably long time.
     
  18. bisco

    bisco cookie crumbler

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    who knows? in 4 or 5 years, we might be able to swap for 20 mile range batteries!
     
  19. chesleyn

    chesleyn Active Member

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    I vote for 40-50 mile range.
     
  20. bisco

    bisco cookie crumbler

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    i'm in!:p